WHO scientists have lent credence to Beijing's assertions that the Covid pandemic originated outside China
The investigators rubbished theory Covid leaked from a lab as fact-finding mission to China concludes
Dr Embarek, who led the probe, said theory is 'extremely unlikely' and should not be studied any further
But he called for further studies into whether virus was imported into China, possibly on frozen foods
Findings will be a PR coup for Beijing, which has repeatedly pointed finger of blame for pandemic overseas
It will also provide ammunition to WHO's critics, who feared trip would become part of Chinese whitewashing